feature edition2021 is required

[rustxj]

[root@iZbp1gvdf3x4z4p8ykn4ndZ subdomaingather]# cargo build --release
error: failed to parse manifest at /root/domain/subdomaingather/Cargo.toml

Caused by:
feature edition2021 is required

this Cargo does not support nightly features, but if you
switch to nightly channel you can add
cargo-features = ["edition2021"] to enable this feature